I can’t say exactly what kit you would need, but I am using the Pi4 and it is working well for me. It’s almost good enough to use in a Live gig at this point.
I have the 7" Pi Foundation display with touchscreen working in my DIY setup. The GUI was just a little to odd for me to use it “touch only” and I ended up building my own encoder board. I am very happy with my build, but there are plenty of days I wish I just went in and got an official V3 complete kit.